JPS6416078A - Noise reduction circuit - Google Patents
Noise reduction circuitInfo
- Publication number
- JPS6416078A JPS6416078A JP62171480A JP17148087A JPS6416078A JP S6416078 A JPS6416078 A JP S6416078A JP 62171480 A JP62171480 A JP 62171480A JP 17148087 A JP17148087 A JP 17148087A JP S6416078 A JPS6416078 A JP S6416078A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- coefficient
- signal
- noise level
- video signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Picture Signal Circuits (AREA)
Abstract
PURPOSE:To obtain a desired S/N at all times and to suppress after image efficiently by detecting a noise level during the vertical blanking period of a video signal and setting the coefficient of the block characteristic of the frequency characteristic depending on the detection level. CONSTITUTION:A coefficient setting circuit 12 sends a signal revising a coefficient K of a coefficient circuit 7 in response to an output signal of a noise level detection circuit 11. The coefficient setting circuit 12 gives a signal to increase the coefficient K of the circuit 7 when the noise level detection circuit 11 discriminates it that the noise level mixed in the video signal is large and the circuit 12 gives a signal to reduce the coefficient K of the circuit 7 when the circuit 11 discriminates it that the noise level mixed in the video signal is small. Thus, even if various video signals having different S/N fed to the input terminal 1, the noise signal is always suppressed with high performance and the after image is also suppressed effectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62171480A JPS6416078A (en) | 1987-07-09 | 1987-07-09 | Noise reduction circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62171480A JPS6416078A (en) | 1987-07-09 | 1987-07-09 | Noise reduction circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6416078A true JPS6416078A (en) | 1989-01-19 |
Family
ID=15923885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62171480A Pending JPS6416078A (en) | 1987-07-09 | 1987-07-09 | Noise reduction circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6416078A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4926261A (en) * | 1988-02-10 | 1990-05-15 | Sony Corporation | Video noise reduction circuit |
US5325203A (en) * | 1992-04-16 | 1994-06-28 | Sony Corporation | Adaptively controlled noise reduction device for producing a continuous output |
-
1987
- 1987-07-09 JP JP62171480A patent/JPS6416078A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4926261A (en) * | 1988-02-10 | 1990-05-15 | Sony Corporation | Video noise reduction circuit |
US5325203A (en) * | 1992-04-16 | 1994-06-28 | Sony Corporation | Adaptively controlled noise reduction device for producing a continuous output |
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